/Engine/Source/Runtime/SignalProcessing/Public/DSP/BlockCorrelator.h
Then for M = `GetNumInputValues()_ the Output array contains: Output = [AutoCorr[0], AutoCorr[1], ..., AutoCorr[M-1], AutoCorr[M], AutoCorr[-M + 1], AutoCorr[-M + 2], ..., AutoCorr[-2], AutoCorr[-1]]
void AutoCorrelate ( const [FAlignedFloatBuffer](API\Runtime\SignalProcessing\DSP\FAlignedFloatBuffer) & Input, [FAlignedFloatBuffer](API\Runtime\SignalProcessing\DSP\FAlignedFloatBuffer) & Output )